produzir a electricidade - cfq - 9.º ano

7/27/2019 Produzir a electricidade - CFQ - 9. ano

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Cincias Fsico-qumicas Produzir a electricidade9. ano

Nome:___________________________________________________________ Data: __________

1. Diz o que entendes por:

1.1. corrente elctrica contnua.

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1.2. corrente alternada.

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2.Como varia o sentido da corrente contnua?

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3. Como se chama a corrente que uma pilha produz?

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4. Como se comporta o sentido de uma corrente alternada?

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5. O que a intensidade da corrente?

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6. O que a diferena de potencial (U)?

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7. Considera os dois circuitos representados na figura:

7.1. Indica em qual dos circuitos no haver passagem da corrente elctrica.

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A B


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7.2. Explica qual o factor que impede a passagem da corrente nesse circuito.

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7.3. Indica qual o nome do conjunto formado pelas duas pilhas.

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8. Observa a seguinte figura:

8.1.Esquematiza o circuito representado.

8.2. Representa com uma seta o sentido convencional da corrente.


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9. Indica quais os circuitos correctamente montados.

Justifica.

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10. Tendo em conta a forma como um voltmetro e um ampermetro so instalados num circuito,

completa os espaos em branco nas frases seguintes:

10.1. Um _______________________ tem de ser instalado ________________________ num

circuito.

10.2. Um _______________________ tem de ser instalado ________________________ nos

terminais de um aparelho num circuito.

Bom trabalho!

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produzir a electricidade - cfq - 9.º ano

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